4-77
DWL-DWK UK.PM6.5 RH
Pressure Reducing Valve
Series DWL and DWK
Catalogue HY11-2500/UK
4
Port size DIN NG10 NG25 NG32
CETOP 5 8 10
Mounting pattern DIN 24340-D10-32
ISO 5781 and ISO 6264
Operating pressure [bar] Pressure ports A, B = 350
Tank port Y = not pressurised
Adjustment range [bar] 0 up to 350
Nominal flow Q [l/min]* 150 250 350
Mounting position as desired
Weight [kg] 4.8 5.9 8.9
Technical data
Characteristics
DWK series with bypass check valve.
Series DWL
Pressure reducing valves of the DWL/DWK series main-
tain a constant pressure on the secondary side (port A)
at a set value.
To achieve accurate response the valve is fitted with a
sliding spool. A flow control valve is located in the spool
to maintain a constant pilot flow.
Characteristic curve
The drawings only show the adjustment type code 5 =
turning knob with ratchet.
Graphic display and function
The symbol shown in the characteristics corresponds to
the DIN/ISO representation for pressure reducing valves
with open neutral position, i.e. the valve goes into the
control setting only when the set secondary pressure is
reached. The Parker valves of the series DWL and DWK
are, in contrast, closed in the neutral position. The ad-
vantage here is that the secondary build-up pressure is
achieved more softly. Pressure peaks or pressure waves
do not reach the actuator.
If the pressure on the secondary side A increases above
the set pressure on the valve, the excess oil is directed
through the pilot valve to reduce pressure. The pilot oil
flow is directed to tank via port Y.
* The nominal flow volume is a recommended value for projecting,
and is not the application limit for the valve which is dependent on
the individual permitted pressure increase value.
Home
Index
Contents
Ordering Code
4-78
DWL-DWK UK.PM6.5 RH
Pressure Reducing Valve
Series DWL and DWK
Catalogue HY11-2500/UK
4
Code Seal
omit NBR
V FPM
Seal
Mechanically
adjustable pressure
reducing valve
Variation
DW
Nominal
size
Code Variation
L
Without bypass
check valve
K
With bypass
check valve
Series
letter
C
Code Adjustment
Hexagon socket
2 screw with
lock nut
61
Turning knob
with E10 lock
Adjustment Pressure
range
Code
Pressure
range
B 70 bar
E 175 bar
G 250 bar
K 350 bar
Series
52
Code
Nominal
size
P15 NG10
P20 NG25
P40 NG32
Ordering Code / Function Representation
*) DWL without bypass check valve
Symbol DWKFunction diagram DWK
Adjustment styles
2. Hexagon socket with lock nut
61. Turning knob with E10 lock
Mounting
Size manifold
DIN 912 12.9 NBR FPM
NG10 SPP3M6B910 BK389 4xM10x50 65Nm SK-DWLC 5P15 SK-DWLC 5P15V
NG25 SPP6M8B910 BK485 4xM10x45 65Nm SK-DWLC 5P 20 SK-DWLC 5P 20V
NG 32 SPP10M12B910 BK390 6 x M10 x50 65Nm SK-DWLC 5P 40 SK-DWLC 5P 40V
Home
Index
Contents
Ordering Code
4-79
DWL-DWK UK.PM6.5 RH
Pressure Reducing Valve
Series DWL and DWK
Catalogue HY11-2500/UK
4
DWL-DWK NG25
Dimensions
DWL-DWK NG10
Home
Index
Contents
Ordering Code
4-80
DWL-DWK UK.PM6.5 RH
Pressure Reducing Valve
Series DWL and DWK
Catalogue HY11-2500/UK
4
Dimensions
Mounting pattern DIN24340-D10-32
DWL-DWK NG32
NG d1 d2 d3 d4 b1 b2 m1 m2 m3
max ±0.2 H12 min. max. ±0.2 ±0.2 ±0.2
10 14.7 M10 4.8 7.5 84 92 42.9 35.7 31.8
25 23.4 M10 4.8 7.5 97 105 60.3 49.2 44.5
32 32 M10 4.8 7.5 114 10 84.1 67.5 62.7
NG m4 m5 m6 m7 m8 n1 n2 n3 n4
±0.2 ±0.2 ±0.2 ±0.2 min. ±0.2 ±0.2 ±0.2 ±0.2
10 21.4 - 21.4 7.1 61 66.7 58.7 33.3 7.9
25 39.7 - 20.6 11.1 78 79.4 73 39.7 6.4
32 59.6 42.1 24.6 16.7 102 96.8 92.9 48.8 4
Home
Index
Contents
Ordering Code
